my goldsish has grown a considerable amount in the past two weeks. He is about 1 1/2 years old, and has steadly been growing thoughout his life, but looks like he's rounding out into a blowfish in the past 2 weeks! What could this be? I don't think (s)he is pregnant, since the only other fish sharing the tank is a Customer (name blocked for privacy). What do you think>